Quote:
Originally Posted by Tcoat
Dynos don't "lie" but they are not the precision instruments that people seem to think they are. Their value in tuning a car and getting the best out of it is invaluable. There usefulness as a **** measuring tool to say "my car has XXX horsepower is valueless.
There can be a huge margin of error when doing dyno pulls. The same car, on the same day, with no changes can show a 20hp range over several pulls. Once you start changing weather conditions, altitudes, how well the equipment is set up and even the make of the dyno into the mix then comparing numbers is almost a waste of time.
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This. The error also gets larger the more power you make. Lets say there is no drive train loss and a dyno error of 5%. A car that makes 100hp could dyno 95-105 and a 500hp car could dyno 475-525, which is why its good to do a few pulls so you can get an average.